VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); if (integerCacheHighPropValue != null) { try { h = Integer.parseInt(integerCacheHighPropValue); h = Math.max(h, 127); // 确保上限不低于默认值127 // Maximum array size is Integer.MAX_VALUE h = Math.min(h, Integer.MAX_VALUE...
127);// Maximum array size is Integer.MAX_VALUEh = Math.min(i, Integer.MAX_VALUE - (-low) -1);} catch( NumberFormatException nfe) {// If the property cannot be parsed into an int, ignore it.}}high = h;//配置⽂件中有值，并且满⾜上⽅条件对⽐及可更改high值cache = new I...
String integerCacheHighPropValue = sun.misc.VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); if (integerCacheHighPropValue != null) { try { int i = parseInt(integerCacheHighPropValue); i = Math.max(i, 127); // Maximum array size is Integer.MAX_VALUE h = Math.min(i, Integer...
* During VM initialization, java.lang.Integer.IntegerCache.high property * may be set and saved in the private system properties in the * sun.misc.VM class. */ private static class IntegerCache { static final int low = -128; static final int high; static final Integer cache[]; static { ...
ArrayIntegerStack(intsize){ this.size=size; array=newInteger[size]; } publicIntegerpush(Integeritem){ if(item==null){ returnnull; } if(this.tag==this.size-1){ returnnull; } this.array[++tag]=item; returnitem; } @Override publicIntegerpop() { ...
So the caching happens in the for-loop. It just runs from the low to high and creates as many Integer instances and stores in an Integer array named cache. As simple as that. This caching is doing at the first usage of the Integer class. ...
Integer只有一个非静态字段value,用来表示其包装的int值。0x80000000和0x7fffffff分别是 int 最小值和最大值的十六进制表示,这里要注意十六进制 int 值在内存中的表示方法,有兴趣的同学可以了解一下,这里先占个坑,有时间单独写[一篇文章]()。 我们都知道int是 4 字节,32 比特,和 C/C++ 不同的时,Java中整型...
sun.misc.VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); if (integerCacheHighPropValue != null) { try { int i = parseInt(integerCacheHighPropValue); i = Math.max(i, 127); // Maximum array size is Integer.MAX_VALUE
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1、以上代码第一段和第二段旨在说明:在-128~127的Integer值并且以Integer x = value;的方式赋值的Integer值在进行==和equals比较时,都会返回true,因为Java里面对处在在-128~127之间的Integer值,用的是原生数据类型int,会在内存里供重用,也就是说这之间的Integer值进行==比较时只是进行int原生数据类型的数值比较...